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layout: Implement default overflow alignment for abspos (#35208)

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According to https://drafts.csswg.org/css-align/#auto-safety-position

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-02-04 23:28:44 +01:00 • committed by GitHub
parent aa09e2b88f
commit 88d01f6303
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GPG key ID: B5690EEEBB952194
9 changed files with 49 additions and 161 deletions
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66
components/layout_2020/positioned.rs
View file

@ -29,7 +29,7 @@ use crate::geom::{
PhysicalRect, PhysicalVec, Size, Sizes, ToLogical, ToLogicalWithContainingBlock,
};
use crate::sizing::ContentSizes;
use crate::style_ext::{ComputedValuesExt, ContentBoxSizesAndPBM, DisplayInside};
use crate::style_ext::{Clamp, ComputedValuesExt, ContentBoxSizesAndPBM, DisplayInside};
use crate::{
ConstraintSpace, ContainingBlock, ContainingBlockSize, DefiniteContainingBlock,
PropagatedBoxTreeData, SizeConstraint,
@ -538,7 +538,7 @@ impl HoistedAbsolutelyPositionedBox {
inline: inline_axis_solver.inset_sum(),
block: block_axis_solver.inset_sum(),
};
let automatic_size = |alignment: AlignFlags, offsets: &AbsoluteBoxOffsets| {
let automatic_size = |alignment: AlignFlags, offsets: &AbsoluteBoxOffsets<_>| {
if alignment.value() == AlignFlags::STRETCH && !offsets.either_auto() {
Size::Stretch
} else {
@ -719,7 +719,7 @@ impl HoistedAbsolutelyPositionedBox {
}
}
#[derive(Clone, Copy)]
#[derive(Clone, Copy, Debug)]
struct RectAxis {
origin: Au,
length: Au,
@ -741,12 +741,12 @@ impl LogicalRect<Au> {
}
#[derive(Debug)]
struct AbsoluteBoxOffsets<'a> {
start: LengthPercentageOrAuto<'a>,
end: LengthPercentageOrAuto<'a>,
struct AbsoluteBoxOffsets<T> {
start: T,
end: T,
}
impl AbsoluteBoxOffsets<'_> {
impl AbsoluteBoxOffsets<LengthPercentageOrAuto<'_>> {
pub(crate) fn either_specified(&self) -> bool {
!self.start.is_auto() || !self.end.is_auto()
}
@ -756,6 +756,12 @@ impl AbsoluteBoxOffsets<'_> {
}
}
impl AbsoluteBoxOffsets<Au> {
pub(crate) fn sum(&self) -> Au {
self.start + self.end
}
}
struct AxisResult {
size: SizeConstraint,
margin_start: Au,
@ -769,7 +775,7 @@ struct AbsoluteAxisSolver<'a> {
computed_margin_end: AuOrAuto,
computed_sizes: Sizes,
avoid_negative_margin_start: bool,
box_offsets: AbsoluteBoxOffsets<'a>,
box_offsets: AbsoluteBoxOffsets<LengthPercentageOrAuto<'a>>,
static_position_rect_axis: RectAxis,
alignment: AlignFlags,
flip_anchor: bool,
@ -906,7 +912,7 @@ impl AbsoluteAxisSolver<'_> {
original_parent_writing_mode: WritingMode,
containing_block_writing_mode: WritingMode,
) -> Au {
let (alignment_container, alignment_container_writing_mode, flip_anchor) = match (
let (alignment_container, alignment_container_writing_mode, flip_anchor, offsets) = match (
self.box_offsets.start.non_auto(),
self.box_offsets.end.non_auto(),
) {
@ -914,15 +920,23 @@ impl AbsoluteAxisSolver<'_> {
self.static_position_rect_axis,
original_parent_writing_mode,
self.flip_anchor,
None,
),
(Some(start), Some(end)) => {
let start = start.to_used_value(self.containing_size);
let end = end.to_used_value(self.containing_size);
let alignment_container = RectAxis {
origin: start,
length: self.containing_size - (end + start),
let offsets = AbsoluteBoxOffsets {
start: start.to_used_value(self.containing_size),
end: end.to_used_value(self.containing_size),
};
(alignment_container, containing_block_writing_mode, false)
let alignment_container = RectAxis {
origin: offsets.start,
length: self.containing_size - offsets.sum(),
};
(
alignment_container,
containing_block_writing_mode,
false,
Some(offsets),
)
},
// If a single offset is auto, for alignment purposes it resolves to the amount
// that makes the inset-modified containing block be exactly as big as the abspos.
@ -986,18 +1000,36 @@ impl AbsoluteAxisSolver<'_> {
};
let free_space = alignment_container.length - size;
let alignment = if self.alignment.flags() == AlignFlags::SAFE && free_space < Au::zero() {
let flags = self.alignment.flags();
let alignment = if flags == AlignFlags::SAFE && free_space < Au::zero() {
AlignFlags::START
} else {
alignment
};
match alignment {
let origin = match alignment {
AlignFlags::START => alignment_container.origin,
AlignFlags::CENTER => alignment_container.origin + free_space / 2,
AlignFlags::END => alignment_container.origin + free_space,
_ => unreachable!(),
};
if matches!(flags, AlignFlags::SAFE | AlignFlags::UNSAFE) ||
matches!(
self.alignment,
AlignFlags::NORMAL | AlignFlags::AUTO | AlignFlags::STRETCH
)
{
return origin;
}
let Some(offsets) = offsets else {
return origin;
};
// Handle default overflow alignment.
// https://drafts.csswg.org/css-align/#auto-safety-position
let min = Au::zero().min(offsets.start);
let max = self.containing_size - Au::zero().min(offsets.end) - size;
origin.clamp_between_extremums(min, Some(max))
}
}

18
tests/wpt/meta/css/css-align/abspos/align-self-default-overflow-htb-ltr-htb.html.ini vendored
View file

@ -1,18 +0,0 @@
[align-self-default-overflow-htb-ltr-htb.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 7]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/align-self-default-overflow-htb-ltr-vrl.html.ini vendored
View file

@ -1,18 +0,0 @@
[align-self-default-overflow-htb-ltr-vrl.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 7]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/align-self-default-overflow-htb-rtl-htb.html.ini vendored
View file

@ -1,18 +0,0 @@
[align-self-default-overflow-htb-rtl-htb.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 7]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/align-self-default-overflow-htb-rtl-vrl.html.ini vendored
View file

@ -1,18 +0,0 @@
[align-self-default-overflow-htb-rtl-vrl.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 7]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/justify-self-default-overflow-htb-ltr-htb.html.ini vendored
View file

@ -1,18 +0,0 @@
[justify-self-default-overflow-htb-ltr-htb.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 7]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/justify-self-default-overflow-htb-ltr-vrl.html.ini vendored
View file

@ -1,18 +0,0 @@
[justify-self-default-overflow-htb-ltr-vrl.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 7]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/justify-self-default-overflow-htb-rtl-htb.html.ini vendored
View file

@ -1,18 +0,0 @@
[justify-self-default-overflow-htb-rtl-htb.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 7]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 14]
expected: FAIL

18
tests/wpt/meta/css/css-align/abspos/justify-self-default-overflow-htb-rtl-vrl.html.ini vendored
View file

@ -1,18 +0,0 @@
[justify-self-default-overflow-htb-rtl-vrl.html]
[.item 3]
expected: FAIL
[.item 4]
expected: FAIL
[.item 7]
expected: FAIL
[.item 10]
expected: FAIL
[.item 11]
expected: FAIL
[.item 14]
expected: FAIL